WORCESTER (CBS/AP) – A Worcester woman and her boyfriend have been arrested after the woman’s 4-year-old daughter died.

Police say they found the girl unresponsive at the couple’s home on West Boylston Drive at about 5:45 p.m. Thursday. She was taken to UMass Memorial Medical Center where she was pronounced dead.

“My daughter is clumsy,and often walks into walls.” That’s how Lymari Acevedo explains her daughter’s death to police.

Thursday night, Worcester police were called to Acevedo’s apartment. Inside, the 4-year-old was unresponsive.

WBZ-TV’s Bill Shields reports.

Acevedo’s boyfriend, Richard Castillo, told police when he found the little girl unconscious, he slapped her on the back. But, the 4-year-old was found with bruises covering her body, “from her chest to her feet,” according to the police report.

Lymari Acevedo told police she sometimes spanks the girl, “but when informed of the hand print on the girl’s back, Lymari remembered that she may have missed a couple of times, and struck the girl in the back,” according to the police report.